Mage Duelist

You’ve practiced techniques to defeat fellow spellcasters, mastering the art of mage duels.

• When you damage a creature, that is concentrating on a spell, with a spell, that creature has disadvantage on the saving throw it makes to maintain its concentration.
• You have advantage on saving throws against spells and other magical effects targeting only you.
• Starting from when you gain the ability to cast 3rd level spells, you always have counterspell prepared and it does not count towards the number of spells you can prepare. Additionally, when you successfully counter a spell using counterspell, you deal can choose to deal 1d6 psychic damage to the caster as you turn their own magic against them. You can use this feature a number of times equal to your proficiency bonus, and you regain all expanded uses when you finish a long rest.